ApplicationNo. 06/748641 filed on 06/25/1985
US Classes:504/212, The hetero ring consists of three nitrogens and three carbons504/214, The hetero ring consists of two nitrogens and four carbons544/211, Additional ring containing544/321, Carbocyclic ring containing544/332Chalcogen attached indirectly to the diazine ring by nonionic bonding
ExaminersPrimary: Ford, John M.
Attorney, Agent or Firm
International ClassesA01N 47/30 (20060101)
A01N 47/28 (20060101)
C07D 521/00 (20060101)
DescriptionFIELD OF THE INVENTION
This invention relates to herbicidally active sulfamoyl urea derivatives, including herbicidal formulations uses thereof to control the growth of noxious plants, i.e., weeds.
DESCRIPTION OF THE INVENTION
This invention concerns sulfamoyl urea derivatives represented by the Formula I: ##STR1## wherein:
Y is oxygen or sulfur;
Z is N or CH;
R1 and R2 are the same or different and represent halogen, C1 to C4 alkyl or alkoxy;
R3 and R4 are the same or different and represent hydrogen, C1 to C4 alkyl, alkoxyalkyl,
R5 is hydrogen, benzoyl, or up to C6 alkyl, haloalkyl, acyl, haloacyl, alkoxyacyl, carbamyl, N-alkylcarbamyl, N,N-dialkylcarbamyl, carboxyalkyl or carboalkoxyalkyl;
R6 is C1 to C6 alkyl, haloalkyl, or alkoxyalkyl; and
R7 is hydrogen, halogen or C1 to C4 alkyl or haloalkyl.
It is, of course, to be understood that agronomically suitable cationic salts as well as stereo and optical isomers of the Formula I compounds are within the scope of this invention.
The Formula I compounds may conveniently by prepared in a two-step reaction, involving reacting in the first step a suitably substituted amino pyrimidine or amino triazine of the Formula II: ##STR2## wherein R1, R2, R3 and Z are aspreviously defined, with a halosulfonyl isocyanate of the formula OCN-SO2 -Hal, wherein Hal is halogen, e.g., chlorine, fluorine or bromine to form the corresponding halosulfonyl urea of the Formula III: ##STR3##
In the second step, the Formula III compound is reacted with at least a stoichiometric amount of a suitably substituted amine of the Formula IV: ##STR4## wherein R4, R5, R6 and R7 are as previously defined, to form a Formula Icompound of the invention.
The invention is further illustrated by the following Examples which describe preparation of certain compounds of this invention.
The following Examples are illustrative of the preparation of certain preferred compounds of this invention.
Preparation of: 1-[2-(1-hydroxyethyl)phenylsulfamoyl]-3-(4-methyl-6-methoxy-1,3,5-triazin- 2-yl)urea
To 75 milliliters of methylene chloride maintained at 0°-5° C. via an ice bath were added 1.4 grams of 4-methyl-6-methoxy-2-amino-1,3,5-triazine and 1.55 grams of chlorosulfonyl isocyanate. After stirring for 3 hours at ice bathtemperature a methylene chloride solution containing 1.0 gram of triethylamine and 1.37 grams of 2-(1-hydroxyethyl)aniline was added dropwise. The reaction mixture was removed from the ice bath, allowed to stir an additional one-half hour and thenpoured into 100 milliliters of 2 percent aqueous hydrochloric acid solution. After phase separation, the organic layer was washed in water and concentrated on a rotary evaporator affording a dark oil. Addition of diethyl ether to the dark oil resultedin the formation of a precipitate which was filtered-off. The filtrate was evaporated and the residue was taken-up in chloroform and again evaporated affording a powdery solid. Vacuum drying afforded 1.7 grams of light tan solid confirmed by NMRanalysis as the desired product.
Preparation: 1-[2-(1-hydroxyethyl)phenylsulfamoyl]-3-(4-methyl-6-methoxy-1,3,5-triazin- 2-yl)urea, acetate ester
To a chloroform solution of 2 equivalents of the sulfamoyl urea prepared as described in Example I were added, with stirring, 2 equivalents of triethylamine and 2 equivalents of acetic anhydride. The reaction mixture was allowed to standquiescent for 24 hours and was then poured into dilute aqueous hydrochloric acid and phase separated. The organic layer was washed with water and extracted with saturated aqueous sodium carbonate. The basic extract was filtered and the filtrateacidified with cold dilute aqueous hydrochloric acid resulting in formation of a white precipitate. After suction drying, the precipitate was dried in a vacuum oven affording 1.0 gram of material confirmed by NMR analysis as the desired product.
Preparation of: 1-[2-(1-methoxyethyl)phenylsulfamoyl]-3-(4-methyl-6-methoxy-1,3,5-triazin- 2-yl)urea
To 75 milliliters of methylene chloride maintained at 0°-5° C. via an ice bath were added 1.4 grams of 4-methyl-6-methoxy-2-amino-1,3,5-triazine and 1.55 grams of chlorosulfonyl isocyanate. After stirring for 3 hours at ice bathtemperature a methylene chloride solution containing 1.0 gram of triethylamine and 1.4 grams of 2-(1-methoxyethyl)aniline was added dropwise. The reaction mixture was removed from the ice bath, allowed to stir an additional one-half hour and thenextracted with aqueous sodium carbonate solution. Acidification with cold, dilute aqueous hydrochloric acid solution afforded a white precipitate which was suction filtered and vacuum dried affording 2.2 grams of material confirmed by NMR analysis asthe desired product.
Although the invention has been illustrated by the foregoing Examples with regard to the preparation of certain compounds within the scope of Formula I, it is to be understood that other compounds within the scope of Formula I may readily beprepared by those skilled in the art simply by varying the choice of starting materials and using the same or similar techniques.
Weed control in accordance with this invention is effected by applying to the soil prior to emergence of weeds therefrom or to the plant surfaces subsequent to emergence from the soil, a herbicidally effective amount of a compound of thisinvention. It is, of course, to be understood that the term "a compound of this invention" also includes mixtures of such compounds or a formulation containing a compound or mixture of compounds of this invention.
The term "herbicidally effective amount" is that amount of a compound of this invention required to so injure or damage weeds such that the weeds are incapable of recovering following application while not causing substantial injury to anyvaluable crop amongst which the weeds might be growing. The quantity of a compound of this invention applied in order to exhibit a satisfactory herbicidal effect may vary over a wide range and depends on a variety of factors, such as, for example,hardiness of a particular weed species, extent of weed infestation, climatic conditions, soil conditions, method of application, and the like. Typically, as little as one or less pound per acre of a compound of this invention would be expected toprovide satisfactory weed control, although in some instances application rates in excess of one pound per acre, e.g., up to 5 or more pounds per acre might be required. Of course, the efficacy of a particular compound against a particular weed speciesmay readily be determined by routine laboratory or field testing in a manner well known to the art. It is expected that satisfactory weed control can be had at a rate of application in the range of 0.1 to 2.0 pounds per acre.
Of course, a compound of this invention can be formulated according to routine methods with any of several known and commonly used herbicidal diluents, adjuvants and carriers. The formulations can contain liquid carriers and adjuvants andcarriers. The formulations can contain liquid carriers and adjuvants such as organic solvents, as well as emulsifiers, stabilizers, dispersants, suspending agents, spreaders, penetrants, wetting agents and the like. Typical carriers utilized in dryformulations include clay, talc, diatomaceous earth, silica and the like. Preferred formulations are those in the form of wettable powders, flowables, dispersible granulates or aqueous emulsifiable concentrates which can be diluted with water at thesite of application. Also, dry formulations such as granules, dusts, and the like, may be used.
When desired, a compound of this invention can be applied in combination with other herbicidal agents in an effort to achieve even broader vegetative control. Typical herbicides which can be conveniently combined with Formula I compound includeatrazine, hexazinone, metribuzin, ametryn, cyanazine, cyprazine, prometon, prometryn, propazine, simazine, terbutryn, propham, alachlor, acifluorfen, bentazon, metolachlor and N,N-dialkyl thiocarbamates such as EPTC, butylate or vernolate. These, aswell as other herbicides described, for example, in the Herbicide Handbook of the Weed Science Society of America, may be used in combination with a compound or compounds of the invention. Typically such formulations will contain from about 5 to about95 percent by weight of a compound of this invention.
The herbicidal formulations contemplated herein can be applied by any of several method known to the art. Generally, the formulation will be surfaced applied as an aqueous spray. Such application can be carried out by conventional groundequipment, or if desired, the sprays can be aerially applied. Soil incorporation of such surface applied herbicides is accomplished by natural leaching, and is of course facilitated by natural rainfall and melting snow. If desired, however, theherbicides can be incorporated into the soil by conventional tillage means.
Compounds of this invention are believed effective for preemergence or postemergence control of a wide variety of broadleaf and grassy weeds. Typical of the various species of vegetative growth that may be controlled, combated, or eliminatedare, for example, annuals such as pigweed, lambsquarters, foxtail, crabgrass, wild mustard, field pennycress, ryegrass, goose grass, chickweed, wild oats, velvetleaf, purslane, barnyardgrass, smartweed, knotweed, cocklebur, kochia, medic, ragweed, hempnettle, spurrey, pondweed, carpetweed, morningglory, ducksalad, cheatgrass, fall panicum, jimsonweed, witchgrass, watergrass, wild turnip, and similar annual grasses and weeds. Biennials that may be controlled include wild barley, campion, burdock, bullthistle, roundleaved mallow, purple star thistle, and the like. Also controlled by the compounds of this invention are perennials such as quackgrass, Johnsongrass, Canada thistle, curly dock, field chickweed, dandelion, Russian knapweed aster,horsetail, ironweed, sesbania, cattail, wintercress, horsenettle, nutsedge, milkweed, sicklepod, and the like.
The compounds prepared as described in the Examples were individually tested for herbicidal efficacy against a variety of broadleaf and grassy weed species, under controlled laboratory conditions of light, humidity and temperature. A solventsolution of each compound was applied, both preemergence and postemergence, to test flats containing the various weed species, and herbicidal efficacy was determined by periodic visual inspection, after application of the compounds vis a vis an untreatedcontrol. Herbicidal efficacy was determined on a Numerical Injury Rating (NIR) scale of from 0 (no injury) to 10 (all plants dead). A NIR rating of 7-9 indicates severe injury; a NIR rating of 4-6 indicates moderate injury, i.e., plant growth isreduced to the extent that normal growth would be expected only under ideal conditions; and a NIR rating of 1-3 indicates slight injury.
The following table gives the average preemergence and postemergence NIR determined for each of the compounds prepared as described in Examples I through III on the broadleaf (BL) and grassy (GR) weed species to which the compounds were applied. Each compound was applied at a rate of 2.0 pounds per acre and the NIR was determined three weeks subsequent to application.
______________________________________ I II III ______________________________________ Pre-BL 9.0 7.5 9.0 Pre-GR 9.4 8.2 8.7 Post-BL 4.5 4.7 5.8 Post-GR 4.2 5.5 4.8 ______________________________________
The broadleaf weeds used in the screening tests were coffeeweed, jimsonweed, tall morningglory, wild mustard, teaweed and velvetleaf. The grassy weeds used in the screening tests were barnyardgrass, large crabgrass, Johnsongrass, wild oats,sicklepod, lambquarters and yellow foxtail. In addition to the above observed herbicidal activities the compounds were found very effective, especially when applied preemergence, in controlling yellow nutsedge, a weed variety that is very difficult tocontrol.
Although the invention has been described in considerable detail by the foregoing, it is to be understood that many variations may be made therein by those skilled in the art without departing from the spirit and scope thereof as defined by theappended claims.